Hollow pole



Aug. 6, 1929. M. J. STAM HOLLOW POLE Filed Dec. 10, 1928 lx. E.

Patented Aug. 6, 1929."

MARTINUS JONNES STAM, OF THE HAGUE, NETHERLANDS. l

yHOLLON POLE.

Application filed December 10, 1928, Serial No. 324,993, and in theNetherlands May 14, 1927.

This invention relates tov a hollow pole comprising a plurality ofinteritting elements and adapted to carry telephone or telegraph wires,and conducting wires for tramway or railway systems. The pole may alsobe used for flag masts, antenna or signal posts, etc., and as a pipeconduit, a foundation-pillar for objects of art, a column for'supporting structural parts, and a supporting post for army tents,military bridges, etc. 1t may be made of any suitable material, inparticular', concrete or reinforced concrete. n

The invention has for its object to provide a pole made up of hollowelements so conn structed that water is prevented from entering thepole, and that the aforesaid elements themselves may be kept unitedunder pressure. To this end, the said elements have their upper endsreduced so as to form a pinlike member which may have a taperedformation or may be provided with a shoulder, and which fits in andsupports the open socket end of the next element. Eachy element containsa portion or member of a sectional anchor or tie-bolt, and byinterconnecting the said sections and tightening them up, the elementsare united so as to form the hollow pole.

An embodiment of the invention is illustrated in the accompanyingdrawing, whereof:

Figure l is a longitudinal vertical section of the improved pole;

Figs. 2 and 3 are enlarged .tragmental yvertical sectional views takenat right angles to each other; and

Figs. 4t and 5 are transverse sections taken, respectively, on lines 1-4, Fig. 2, and 5-5, Fig. 1.

The aforesaid dr( wing shows a pole having a hollow top piece or cap 1,which may have any desired exterior shape. This top element, `iustas theother elements, encloses the upper end 10 of the next lower element 2,which end is reduced and made so as to form a pin-like part or member.1n the embodiment illustrated, the base piece 3' is adapted to supportthe whole pole and it is provided with a recess for the insertion oit ananchoring or tie bolt 4, passing through an axial bore 9 in the upper orpin part 10 of the base-piece. The pins 10 of all of the by means of thelatter and the washers 7.

The said anchoring bolts 4: form the sections of a sectional anchoruniting the various elements l, 2 and 3. The hollow lower or socketparts oit' the elements surrounding the pins l0 .of preceding elementsrest on shoulders ll, which are formed at the place where the pin partmerges into the enlarged hollow or socket` part of an element.

The shape of the base piece 3 may be varied, and the base piece itselfmay be made larger or smaller in accordance with the particular natureof the subsoil.

It the poles arer to be used as foundation pillars they are providedwith a pointed bottom element not shown. The pointed end may be providedwith a bore for the passage of an anchoring section therethrough.

Foundation pillars of this type have the advantage that in rammingtrames, particularly when using steam rams, the frames may now be madevery light and short. As soon as a pillar element has been rammed in,another element can be superposed upon it. The ramming-in may beeffected by means of a pole cap placed on the shoulder l1 of a poleelement.

By placing a tightening ring of suitable material on the shoulder 11 ofa pole ele ment, an absolutely watertight joint may be obtained. Thehollow space in the lowermost element or in the base piece may then belled up wholly or partially with a waterprooi1 subst-ance, such as taror asphalt, after the insertion oi the rfirst anchoring section. Whenthe neXt element has been placed in position on the shoulder of thepreceding one, the anchoring section ot the former is hooked inthe loopnut or eye 5 at the upper end of the anchor section of the latterelement. Further, the individual elements may have an increasingdiameter or may taper in such a manner that the pole grows thinnergradually or may have a staggered formation from element to element.

I claim:

A pole, comprising a succession of interfitting elements each having alower socket portion and an upper portion of reduced connecting thesuccessive pole elements together under pi'essiue, each section of theanchoibeing zii-ranged within an element of 10 the pole. v

In testimony whereof .l atlix my signature.

MARTIN US JONNES STAM.

